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    SubjectRe: [PATCH v32 0/4] scsi: ufs: Add Host Performance Booster Support
    On 2021-03-31 09:15, Daejun Park wrote:
    > Changelog:
    >
    > v31 -> v32
    > Delete unused parameter of unmap API.
    >
    > v30 -> v31
    > Delete unnecessary debug message.
    >
    > v29 -> v30
    > 1. Add support to reuse bio of pre-request.
    > 2. Delete unreached code in the ufshpb_issue_map_req.
    >
    > v28 -> v29
    > 1. Remove unused variable that reported by kernel test robot.
    >
    > v27 -> v28
    > 1. Fix wrong return value of ufshpb_prep.
    >
    > v26 -> v27
    > 1. Fix wrong refernce of sense buffer in pre_req complete function.
    > 2. Fix read_id error.
    > 3. Fix chunk size checking for HPB 1.0.
    > 4. Mute unnecessary messages before HPB initialization.
    >
    > v25 -> v26
    > 1. Fix wrong chunk size checking for HPB 1.0.
    > 2. Fix wrong max data size for HPB single command.
    > 3. Fix typo error.
    >
    > v24 -> v25
    > 1. Change write buffer API for unmap region.
    > 2. Add checking hpb_enable for avoiding unnecessary memory allocation.
    > 3. Change pr_info to dev_info.
    > 4. Change default requeue timeout value for HPB read.
    > 5. Fix wrong offset manipulation on ufshpb_prep_entry.
    >
    > v23 -> v24
    > 1. Fix build error reported by kernel test robot.
    >
    > v22 -> v23
    > 1. Add support compatibility of HPB 1.0.
    > 2. Fix read id for single HPB read command.
    > 3. Fix number of pre-allocated requests for write buffer.
    > 4. Add fast path for response UPIU that has same LUN in sense data.
    > 5. Remove WARN_ON for preventing kernel crash.
    > 7. Fix wrong argument for read buffer command.
    >
    > v21 -> v22
    > 1. Add support processing response UPIU in suspend state.
    > 2. Add support HPB hint from other LU.
    > 3. Add sending write buffer with 0x03 after HPB init.
    >
    > v20 -> v21
    > 1. Add bMAX_DATA_SIZE_FOR_HPB_SINGLE_CMD attr. and fHPBen flag support.
    >
    > v19 -> v20
    > 1. Add documentation for sysfs entries of hpb->stat.
    > 2. Fix read buffer command for under-sized sub-region.
    > 3. Fix wrong condition checking for kick map work.
    > 4. Delete redundant response UPIU checking.
    > 5. Add LUN checking in response UPIU.
    > 6. Fix possible deadlock problem due to runtime PM.
    > 7. Add instant changing of sub-region state from response UPIU.
    > 8. Fix endian problem in prefetched PPN.
    > 9. Add JESD220-3A (HPB v2.0) support.
    >
    > v18 -> 19
    > 1. Fix null pointer error when printing sysfs from non-HPB LU.
    > 2. Apply HPB read opcode in lrbp->cmd->cmnd (from Can Guo's review).
    > 3. Rebase the patch on 5.12/scsi-queue.
    >
    > v17 -> v18
    > Fix build error which reported by kernel test robot.
    >
    > v16 -> v17
    > 1. Rename hpb_state_lock to rgn_state_lock and move it to corresponding
    > patch.
    > 2. Remove redundant information messages.
    >
    > v15 -> v16
    > 1. Add missed sysfs ABI documentation.
    >
    > v14 -> v15
    > 1. Remove duplicated sysfs ABI entries in documentation.
    > 2. Add experiment result of HPB performance testing with iozone.
    >
    > v13 -> v14
    > 1. Cleanup codes by commentted in Greg's review.
    > 2. Add documentation for sysfs entries (from Greg's review).
    > 3. Add experiment result of HPB performance testing.
    >
    > v12 -> v13
    > 1. Cleanup codes by comments from Can Guo.
    > 2. Add HPB related descriptor/flag/attributes in sysfs.
    > 3. Change base commit from 5.10/scsi-queue to 5.11/scsi-queue.
    >
    > v11 -> v12
    > 1. Fixed to return error value when HPB fails to initialize pinned
    > active
    > region.
    > 2. Fixed to disable HPB feature if HPB fails to allocate essential
    > memory
    > and workqueue.
    > 3. Fixed to change proper sub-region state when region is already
    > evicted.
    >
    > v10 -> v11
    > Add a newline at end the last line on Kconfig file.
    >
    > v9 -> v10
    > 1. Fixed 64-bit division error
    > 2. Fixed problems commentted in Bart's review.
    >
    > v8 -> v9
    > 1. Change sysfs initialization.
    > 2. Change reading descriptor during HPB initialization
    > 3. Fixed problems commentted in Bart's review.
    > 4. Change base commit from 5.9/scsi-queue to 5.10/scsi-queue.
    >
    > v7 -> v8
    > Remove wrongly added tags.
    >
    > v6 -> v7
    > 1. Remove UFS feature layer.
    > 2. Cleanup for sparse error.
    >
    > v5 -> v6
    > Change base commit to b53293fa662e28ae0cdd40828dc641c09f133405
    >
    > v4 -> v5
    > Delete unused macro define.
    >
    > v3 -> v4
    > 1. Cleanup.
    >
    > v2 -> v3
    > 1. Add checking input module parameter value.
    > 2. Change base commit from 5.8/scsi-queue to 5.9/scsi-queue.
    > 3. Cleanup for unused variables and label.
    >
    > v1 -> v2
    > 1. Change the full boilerplate text to SPDX style.
    > 2. Adopt dynamic allocation for sub-region data structure.
    > 3. Cleanup.
    >
    > NAND flash memory-based storage devices use Flash Translation Layer
    > (FTL)
    > to translate logical addresses of I/O requests to corresponding flash
    > memory addresses. Mobile storage devices typically have RAM with
    > constrained size, thus lack in memory to keep the whole mapping table.
    > Therefore, mapping tables are partially retrieved from NAND flash on
    > demand, causing random-read performance degradation.
    >
    > To improve random read performance, JESD220-3 (HPB v1.0) proposes HPB
    > (Host Performance Booster) which uses host system memory as a cache for
    > the
    > FTL mapping table. By using HPB, FTL data can be read from host memory
    > faster than from NAND flash memory.
    >
    > The current version only supports the DCM (device control mode).
    > This patch consists of 3 parts to support HPB feature.
    >
    > 1) HPB probe and initialization process
    > 2) READ -> HPB READ using cached map information
    > 3) L2P (logical to physical) map management
    >
    > In the HPB probe and init process, the device information of the UFS is
    > queried. After checking supported features, the data structure for the
    > HPB
    > is initialized according to the device information.
    >
    > A read I/O in the active sub-region where the map is cached is changed
    > to
    > HPB READ by the HPB.
    >
    > The HPB manages the L2P map using information received from the
    > device. For active sub-region, the HPB caches through ufshpb_map
    > request. For the in-active region, the HPB discards the L2P map.
    > When a write I/O occurs in an active sub-region area, associated dirty
    > bitmap checked as dirty for preventing stale read.
    >
    > HPB is shown to have a performance improvement of 58 - 67% for random
    > read
    > workload. [1]
    >
    > [1]:
    > https://www.usenix.org/conference/hotstorage17/program/presentation/jeong
    >
    > Daejun Park (4):
    > scsi: ufs: Introduce HPB feature
    > scsi: ufs: L2P map management for HPB read
    > scsi: ufs: Prepare HPB read for cached sub-region
    > scsi: ufs: Add HPB 2.0 support
    >
    > Documentation/ABI/testing/sysfs-driver-ufs | 162 ++
    > drivers/scsi/ufs/Kconfig | 9 +
    > drivers/scsi/ufs/Makefile | 1 +
    > drivers/scsi/ufs/ufs-sysfs.c | 22 +
    > drivers/scsi/ufs/ufs.h | 54 +-
    > drivers/scsi/ufs/ufshcd.c | 74 +-
    > drivers/scsi/ufs/ufshcd.h | 29 +
    > drivers/scsi/ufs/ufshpb.c | 2387 ++++++++++++++++++++
    > drivers/scsi/ufs/ufshpb.h | 277 +++
    > 9 files changed, 3013 insertions(+), 2 deletions(-)
    > create mode 100644 drivers/scsi/ufs/ufshpb.c
    > create mode 100644 drivers/scsi/ufs/ufshpb.h

    To the entire series:

    Tested-by: Can Guo <cang@codeaurora.org>

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